Modal action add selected

[hsbicalho]

I have this modal, is a default action, but i need to change the action "Add Selected" script to update the selected records.

that is my action

THAT IS THE CODE FROM BulkAddIncidents Class

var BulkAddIncidents = Class.create();

BulkAddIncidents.prototype = Object.extendsObject(AbstractAjaxProcessor, {

    PARAMS: {

        SYSID: "sysparm_sys_id",

        PARENTTABLE: "sysparm_parent_table",

        TABLE: "sysparm_table",

        VIEW: "sysparm_view",

        NOSTACK: "sysparm_nostack",

        QUERY: "sysparm_query",

        PARENTCOLUMN: "sysparm_parent_column",

        FIXEDQUERY: "sysparm_fixed_query",

        JS: "sysparm_js",

        JSTYPE: "sysparm_js_type",

        SELECTEDTASKS: "sysparm_selected_tasks",

        TYPE: "sysparm_type"

    },

    getURL: function(){

        var sysId = this.getParameter(this.PARAMS.SYSID);

        var pTable = this.getParameter(this.PARAMS.PARENTTABLE);

        var url = new GlideURL("incident_add_records.do");

        var parentColumn = gs.getProperty('com.snc.incident.link_to_task.'+pTable);

        //var fixedQuery = "active=true^" + parentColumn + "ISEMPTY";

        var fixedQuery = parentColumn + "ISEMPTY";

        url.set(this.PARAMS.SYSID, sysId);

        url.set(this.PARAMS.VIEW, "default");

        url.set(this.PARAMS.NOSTACK, "true");

        url.set(this.PARAMS.QUERY, "ORDERBYDESCsys_created_on");

        url.set(this.PARAMS.TABLE, "incident");

        url.set(this.PARAMS.PARENTCOLUMN, parentColumn);

        url.set(this.PARAMS.FIXEDQUERY, fixedQuery);

        url.set(this.PARAMS.JS, "incident_link_task.js");

        url.set(this.PARAMS.JSTYPE, "file_system");

        return url;

    },

    linkTasks: function(){

        var taskSysId = this.getParameter(this.PARAMS.SYSID);

        var table = this.getParameter(this.PARAMS.TABLE);

        var selectedRecords = this.getParameter(this.PARAMS.SELECTEDTASKS);

        var query = this.getParameter(this.PARAMS.QUERY);

        var parentColumn = this.getParameter(this.PARAMS.PARENTCOLUMN);

        var type = this.getParameter(this.PARAMS.TYPE);

        if (!taskSysId) {

            gs.error("[BulkAddIncidents] Invalid Parameter - sysparm_sys_id is empty or null");

            return;

        }

        if (!table) {

            gs.error("[BulkAddIncidents] Invalid Parameter - sysparm_table is empty or null");

            return;

        }

        if (!parentColumn) {

            gs.error("[BulkAddIncidents] Invalid Parameter - sysparm_parent_column is empty or null");

            return;

        }

        var relatedRecordGr = new GlideRecord(table);

        if (relatedRecordGr.isValid() && relatedRecordGr.canWrite() && relatedRecordGr.getElement(parentColumn).canWrite()) {

            relatedRecordGr.addQuery(parentColumn, 'null');

            if (type == 'add_selected')

                relatedRecordGr.addQuery('sys_id', 'IN', selectedRecords);

            else

                relatedRecordGr.addEncodedQuery(query);

            relatedRecordGr.setValue(parentColumn, taskSysId);

            relatedRecordGr.updateMultiple();

        }

        return;

    },

    canShowAddButton : function(parent, current) {

        var field = gs.getProperty('com.snc.incident.link_to_task.' + parent.sys_class_name);

        return parent.active == true && current.isValidField(field);

    },

    type: 'BulkAddIncidents'

});